function db_field_set_no_default

7.x database.inc db_field_set_no_default($table, $field)
6.x database.pgsql.inc db_field_set_no_default(&$ret, $table, $field)
6.x database.mysql-common.inc db_field_set_no_default(&$ret, $table, $field)

Set a field to have no default value.

Parameters

$ret: Array to which query results will be added.

$table: The table to be altered.

$field: The field to be altered.

Related topics

Schema API
A Drupal schema definition is an array structure representing one or more tables and their related keys and indexes. A schema is defined by hook_schema(), which usually lives in a modulename.install file.
1 call to db_field_set_no_default()
system_update_6019 in drupal-6.x/modules/system/system.install
Reconcile small differences in the previous, manually created mysql and pgsql schemas so they are the same and can be represented by a single schema structure.

File

drupal-6.x/includes/database.pgsql.inc, line 737
Database interface code for PostgreSQL database servers.

Code

function db_field_set_no_default(&$ret, $table, $field) {
  $ret[] = update_sql('ALTER TABLE {' . $table . '} ALTER COLUMN ' . $field . ' DROP DEFAULT');
}